Non-eutectic structure weld joint of copper-aluminum thin wall pipe and its manufacturing method

A manufacturing method which manufactures non-eutectic structure welded joint of copper-aluminum thin wall pipe, the method comprising:

• providing one copper pipe and one aluminum pipe, respectively, providing one end of the copper pipe with a nosing;
• pre-setting a metal rod in the nosing end of copper pipe welded part;
• placing the copper pipe on the travelling electrode group and fixing it with a high-pressure cylinder;
• placing the aluminum pipe on a fixed electrode group and fixing it with the high-pressure cylinder;
• installing a felder at the corresponding position of fixed electrode group, the felder being composed of materials which have high heating resistance and low heat transfer efficiency, and an intracavity shape of the felder is in conformity with profile of the aluminum pipe;
• ensuring the end of aluminum pipe is aligned with the felder during welding, pushing the travelling electrode group with copper pipe to the aluminum pipe by a pushing cylinder, at the same time connecting a circuit, so the copper-aluminum combined zone is heated by electric resistance heating moving the copper pipe to the interior of aluminum pipe continuously at the role of the pushing cylinder;
• during the moving, using pushing pressure and welding current, regulating the parameters once automatically at intervals of 1˜2 mm, so temperature of copper-aluminum weld can be controlled;
• and drawing out the metal rod after power-down and cooling.